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Question

Estimate the following product by rounding off each number to nearest tens :

1385×789


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Solution

Given, the product is 1385×789.

For rounding off to the nearest tens, we first check the digit at one's place. If the digit at one's place is less than 5 then we replace it by zero but if the digit at one's place is 5 then we add 1 to ten's place digit and replace one's place by zero.

We have,

13851390 7897901385×7891390×790 =1098100

Hence, the required round off is 1385×789=1098100.


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